Moving from traditional surveying to drones means breaking the rules. Nevertheless, I believe we should master it before breaking it and move beyond to create unexpected solutions.
We all agree Drones are disrupting the technology. Actually, they are democratizing surveying and photogrammetry applications to generate continue opportunities. I remember the similar original marketing message of the EPFL spinoff @Pix4D and today it is a reliable world leader in the industry.
Nevertheless, it is curios and even worth to summarize how all that evolved in the last 100 years. This massive digital book just promoted by @Jurgen Dold, President GSI at Hexagon AB gives a clear overview of the work made by Wild and Kern up to Leica.